Plastics Industry

Designing and Manufacturing Silos for the Plastics Industry

Aluminium Silos for the Plastics Industry

Silos for the storage of plastic feedstock for moulding equipment are fairly straightforward, however in recent years the introduction of recycled materials and the need for greater raw material homogeneity has led to the development of more complex silo designs.

Below is a summary of some of the factors to consider when purchasing silos for plastic feedstock.


1) Storage Volume and Silo Shape

The storage capacity of a silo is primarily determined by its height and diameter; however consideration needs to be given to how the silo is filled and emptied. When granules or pellets are loaded into the top of a silo, they form a cone. Therefore, additional free space called ullage or headspace is required to accommodate this cone during the filling process. The shape of this cone and therefore the space required is determined by the flow characteristics of the plastic and its granular shape.

At the bottom of the silo, the outlet diameter and flow characteristics / form of the raw material determine the design and angle of the cone shaped outlet section. Barton Fabrications' 30+ years design experience ensures that the optimum angle is selected for free flow of feedstock to reduce the need for mechanical vibrators.

The Barton Fabrications Silo Capacity Calculator tool can be used to calculate an approximate silo storage capacity.


Barton Fabrications Cone Blender

Barton Fabrications Cone Blender

2) Homogeneity and Feedstock Blending

The introduction of recycled materials into plastic processing has driven the need for feedstock blending. In response, Barton Fabrications have produced a unique design which achieves this inside the silo without the need for mechanical mixing. A specially constructed outlet nozzle carrying shaped blades ensures that material is taken from different sections inside the silo during discharge. The novel approach has generated significant global interest and silos have been exported as far afield as Korea. See silos installed by Dong Yang Corporation (select blending silo).

As material characteristics vary considerably, Barton Fabrications have produced a clear acrylic development silo which, when combined with multi-coloured feedstock, demonstrates the mixing capability of the silo system. To request an onsite trial of this system contact Mark Barton on sales@bartonfabs.co.uk.


Silo load cells awaiting assembly

Silo load cells awaiting assembly

3) Silo Content Measurement

Monitoring stock is an important part of inventory management and Barton Fabrications silos can be supplied complete with Applied Weighing load cells and remote telemetry systems. For more information contact Mark Barton on sales@bartonfabs.co.uk or see the Applied Weighing website.

Installations Include:

Amcor
Beckton Dickinson
C & C Marshall Ltd
Colloids Ltd
Dugdale
Duraflex Ltd
Gelpack Excelsior Ltd
Goodyear
Hydro Polymers Ltd
IKO Plc
Intier Systems Ltd
Linpac Ltd
Logoplaste
Nampak Plc
Polypipe
Quinn Packaging
RPC
Sharp Interpack
Synseal Extrusions Ltd
United Wire Ltd
Wavin
Zotefoams Plc

We have a wide experience of designing silos and blenders for storing different plastics gained from installs at most of the major injection moulding companies.